#637BBF#637BBF

#637BBF is a mid, moderate blue. Relative luminance 0.206; OKLCH L 59.4% C 0.108 H 268.3°. Best body text is #000000 at 5.12:1 contrast (WCAG AA passes).

Color values

HEX	#637BBF
RGB	rgb(99, 123, 191)
HSL	hsl(224, 42%, 57%)
HSV	hsv(224, 48%, 75%)
CMYK	cmyk(48.2%, 35.6%, 0%, 25.1%)
CIE-LAB	lab(52.49, 10.07, -38.37)
CIE-LCH	lch(52.49, 39.66, 284.70°)
OKLab	oklab(59.39% -0.0033 -0.1081)
OKLCH	oklch(59.39% 0.108 268.3)
XYZ	xyz(21.6295, 20.5788, 52.1125)
Luminance	0.2058 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#637BBF #BFA763

analogous

#63A9BF #637BBF #7963BF

triadic

#637BBF #BF637B #7BBF63

tetradic

#637BBF #BF63A9 #BFA763 #63BF79

square

#637BBF #BF63A9 #BFA763 #63BF79

split-complementary

#637BBF #BF7963 #A9BF63

monochromatic

#314377 #435CA2 #637BBF #8EA0D1 #BAC4E3

Accessibility & contrast

On white

4.10

#637BBF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.12

#637BBF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #637BBF

5.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##637BBF	#FFFFFF	#000000	##000000
##637BBF	1.00	4.10	5.12	5.12
#FFFFFF	4.10	1.00	21.00	21.00
#000000	5.12	21.00	1.00	1.00
##000000	5.12	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6182C2

Deuteranopia (green-blind)

#5879BD

Tritanopia (blue-blind)

#3E8994

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #637bbf;
/* rgb */ color: rgb(99, 123, 191);
/* oklch */ color: oklch(59.4% 0.108 268.3);

Tailwind

colors: {
  custom: {
    50: '#94a0d2',
    500: '#637bbf',
    950: '#000000',
  },
}

SCSS

$custom: #637bbf;
$custom-light: #94a0d2;
$custom-dark: #000000;

JSON

{
  "hex": "#637bbf",
  "rgb": {
    "r": 99,
    "g": 123,
    "b": 191
  },
  "hsl": {
    "h": 224.348,
    "s": 41.818,
    "l": 56.863
  },
  "oklch": {
    "l": 0.59388,
    "c": 0.10812,
    "h": 268.3
  },
  "luminance": 0.2058
}

Semantic roles & 50–950 ramp

primary

#637BBF

secondary

#D2C8AC

accent

#B156D2

background

#F9F9FC

surface

#F2F2F9

border

#CCCCD2

text

#0E0E14

muted

#7E7E82

Preview Lab

Preview with #637BBF

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →